This is my texture pack that I did for use with a few different mods, it's a bit of a work in progress, but all of the items and IC2 blocks are done. I play with a few mods usually, so there's also support for Redpower's world blocks like the ores, marble, and stuff, as well as all of Railcraft's blocks and rails.
This texture pack is made to work with Tekkit 2.1.1
Some of the textures will work with later versions of mods; even if they aren't included in Tekkit yet.
Minecraft 1.2.5; World blocks, Items, Armours, Mobs(all villagers, ghasts, chicken, enderman) Items (cart, chests), Paintings
-randommobs for Skeletons, Zombies, Blazes, Spider, Cave Spider, Creeper, Pig Zombie
Industrialcraft2 1.9; Items, machines, world blocks, armours.
-Advanced machines 3.6
-Compact Solars 1.2
-Charging Bench 1.7.1
Nether Ores 1.1.2
Redpower 2.0; Items, world blocks. Machines are currently from Eloraam's 32px pack.
Buildcraft 2.1.12; Items
-Forestry 188.8.131.52; world blocks, items, most machines (no bees) - note: I'm not gonna keep up with Forestry unless there's a real demand for it as it's no longer in the modpack I use.
Download it here: http://minecraftcustomizer.net/pack/Blockheads
Or here if you just want the file: http://dl.dropbox.com/u/21315217/Blockheads-tekkit.zip