I'm going to tell you about my whole portable rig. I use it for traveling, but it would work awesome for keeping your stuff organized, safe, handy and in a small footprint at home too.
I have the plastic vallejo paint case, and I like it because the foam keeps my paints in the same place all the time. I have them organized the way I need, and sometimes I don't even have to look when I'm grabbing. You could easily get a plastic tackle box similar to one of freak's trays in his picture, and then fill it with 1" thick open-cell foam, and then punch holes in to firmly keep the paints in place.
For brushes and conversion/sculpting tools, I have a small artbin case that opens up into two sections (one in the lid and one in the bottom). I keep the clippers et al. in the bottom, and then in the lid, which has smaller compartments, I keep brushes (I don't ever throw out the plastic bristle covers), magnets, custom plasticard tools and the like.
To this I add a Loew Cornell water jar (the one with the scrubby pad in the bottom) that has it's lid sealed with silicone caulk to prevent it from leaking when I close it and move it about. A small mailing box of inks, unusual paints and such goes along with a small chessex miniature case (I like the 12 figure case) to complete the kit.
I keep the whole thing in a bag that resembles a cross between a gym bag and a carry-on luggage bag. It opens at the top like a gym bag to make it easy to pack, but has a rigid bottom and extendable handle with wheels when my shoulders are full.
With my specific supplies, it comes out to about 6.5 lbs., and is about 2'x1'x1' in dimension. If I'm gong someplace new, I still have space for a small lamp and daylight bulb; sometimes I paint at my friend's boardgame night, and I usually can fit a copy Arkham Horror in there if I carry the minis in my hand.