This is just a thread to cover various ideas I have. I've confined them to one thread in order to not make numerous smaller threads. I may add more later, or make changes to current ideas.
Constructive criticism is very much welcome, if you don't like an idea, I'd like to know why, you might even change my mind.
Now onto the ideas:
Placing maps on blocks - Basically stated, a map can be placed on a block, similarly to how they can be placed on walls via an item frame. What may be the point of this? It's mostly an aesthetic, it just adds more variety to map placement. You can view the map just as it can be done on a wall. An item frame would not be necessary for it. With that being said, I realize some may think that this defeats the point of placing it on a wall, so it requires compensation. To be fair, observing a map from a wall is more convenient than looking down, and not directly at the whole map, unless standing on the map, the viewpoint would be somewhat angled. It only seems logical to me, as many maps are placed on surfaces, instead of on walls. An example of this would be military placing maps on tables in order to draw and plan tactics on said map. I would agree it is not an important change, but I personally think it would be a simple, yet aesthetically pleasing addition.
Cheval de frise (Spiked Barricades) - Though I had the idea before searching, I did come across a slightly similar idea from several years ago that received little attention here; however, I do not like the concept they came up with. My idea is different in that these barricades purpose would be to provide a simple defense mechanism, similar to cactus, while being more fitting to places outside of deserts. These simple fortifications can be used for several purposes: damaging mobs/players (as cacti do), serving as an obstacle for mobs/players to pass through in order to reach a location (useful against horse-riding attackers), and improving upon simple cactus barricades. How might these be an improvement? For several reasons, namely they can be placed side by side, fit in all environments, and can be placed on practically any block. In contrast, cacti can only be placed on sand, cannot be placed side by side, and look out of place in biomes outside of the desert. As for the craft recipe, they would come in two forms, a weaker, flammable wooden barricade made of wood, and a stronger, non-flammable iron one. To craft, a wooden barricade, one must possess 5 wooden planks (or logs, please comment which you think is more balanced!), in the shape of an X. For iron, it is the same formation of an X, but instead of wood, of course, iron ingots are used. I would suggest that the wooden version do 1/2 heart of damage (on par with cactus), or 1 whole heart, no greater; For the iron variant, 1-2 hearts of damage. Some may wonder, will this defeat this use of cactus? The answer is no, cacti can still be used as an efficient barricade, that can be cheaper, is non-flammable, and can be made up to 3 blocks tall, whereas these spiked barricades would be 1-1 & 1/2 blocks tall (I'm undecided whether they should work similar to fences and cannot be climbed over, or if they should be standard height.) Cacti also would be more eye-pleasing in desert biomes, where they are typically used. [For more information on Cheval de frise, see this link.]
Heathland - A new less common biome type (Yes I know 1.7 was the "update that changed the world," but I don't remember reading anywhere that future updates would not include more biomes.) A biome similar to plains, characterized and separated from the latter by shrubs and a distinct flower, the heather. (Shrubs and Heathers explained in a separate suggestion). Villages can spawn here, as do regular passive mobs due to its rather flat nature. (To see more about heaths, click here.)
Shrubbery - In desert biomes we have dead shrubs, it only seems logical that these have living variants. These would grow in plains, savanna, and heathland (if added) biomes.
Heather - A new flower/shrub type, it grows naturally only in heathland biomes. (For more about heathers, see here.)
Streams/Creeks/Brooks/Gullies - A smaller version of a river. It's that simple, I haven't seen anyone else suggest it, so I figured I would. These would spawn in any biome that can have water.
Gulches - A dry creekbed (not riverbed), an aesthetic geographical feature that occurs in deserts (and possibly mesas). It adds a bit of character to deserts basically, just another "realistic" touch. (See a gulch here.)
That's all I have for now, please let me know what you think of each idea. I put a good amount of time into writing this to be thorough, have a nice day!