So friend of mine recently picked up a T2i only for Photography and no interest in Video. Most of the shots he's been sharing is all related to close up nature / macro type images. There's several things he can probably improve upon such as shutter speed, aperture, and ISO settings, but he's learning. Another great item to really boost the color, focus, and sharpness with Macro photography is Flash Lighting. Macro flashes are designed to throw the light evenly around a small subject providing almost shadowless lighting. Of course you have to be pretty serious about Macro photography before you getting into the flashes, as the good ones like the Canon MF-14EX TTL (above) will easily run you over $400 dollars.
If you want to go a bit cheaper with off the shelf gear, there are some options such as the Ray Ring flash adapter that bend the light from your normal Speedlite. This item sits over your existing Flash. The Ray Ring will still run you about $199.95. There's obviously clones to everything these days and you can find Ray Ring Flash clones (probably not the same build quality) called O flashes for around $32.00 dollars (below).
If you're on the cheap cheap like me, this all reminded me of that very old DIY Ring-Flash article and got me inspired to try my hand at it. I'm sure he's not ready to dish out quite so much money, so maybe I can whip something up for him to get better photos on the cheap. This thing looks pretty effective.