You may be interested in my Mod Manager to easily manage your mods.
Thanks to Samkio & Torrent for this video.
Here's a giant painting, created by samalot.
The paint mod allows you to craft paintbrushes which you can then use to paint on most blocks.
You can color the paintbrush by putting it in a crafting table with any dye.
You can also make a paint chipper, which acts like an eraser.
You can wash paint off using water (or lava). The paint mod will generate a file called "world.paint" in your saves. If you delete this file, all the paint in the world will be cleared.
Detail brushes can be crafted by using a feather instead of a wool block. They will paint much smaller areas. Also, a paint knife, crafted with flint instead of an iron ingot, can remove small areas of paint.
If you want to rinse a brush off, so that it can be dyed a different color, throw the brush in a body of water. I mean, you have to manually throw the item (with the Q key, unless you've changed it) into a water block.
For the first download, simply install the contents of "Put in JAR" into minecraft.jar (remember to delete META-INF). Be sure to read the readme! If you need to get the mod working with ModLoader, the readme explains how.
For the server download, install the files into minecraft_server.jar. Make sure you're using the .jar and not the .exe, because there's no way to mod the .exe. The server download is only for the vanilla server. It doesn't work for Bukkit.
If you are interested in contributing, go here. Read the README.
General If you ask a question answered in this post, I will not help you and other forum members may rage at you.
You may not distribute these mods, or for that fact anything else I've made, without my explicit permission. You may not decompile any of these mods for any reason (the World Generator Mod has a slightly modified disclaimer). If you would like to include this mod in a mod pack or compilation, please send me a PM with information and most likely I'll let you.
The Paint mod looks really awesome. Could you give a few more details about the SMP version? For instance if everyone has to have the singleplayer mod alongside the server also having it, and any know bugs?
I'd be even happier if you could add a new item.. a fine paintbrush made from string rather than wool, for painting single pixels.
If you install the SMP version, everyone connected to the server must have the client mod. If they don't, they will be kicked (invalid packet). It has no known bugs, but it also hasn't been tested as rigorously as the singleplayer version.
I like the idea of a detail brush! I'll probably add that soon.
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I made pistons. You might be interested in my mod manager.