I wanted prismarine for my server but wasn't ready to drop my mods to upgrade to 1.8... so, I started making my own. Most of it is done other than some odds and ends to finish. I also added tools and armor. The tools can be dyed to your liking and respond very well to the dyes with very vibrant colors. Once this mod is updated to 1.8, I will remove the modded blocks/items(since they will exist already) other than the tools and armor and then expand upon the extra functionality of this nifty new crafting material.
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2207800-prismarine-additional-features-for-prismarine