I dunno about icons, but it would be nice if you could have more than 4-5 visible characters for a macro title. Changing to a smaller or narrower font, and/or multi-line text would be nice. Kinda annoying having to figure out an abbreviated naming system for a dozen different cure spells or names for the -na spells along with the debuff spells themselves.

Right now my macro names look kinda like:
| Cur1 | Cur2 | Cur3 | Cur4 | Cur5 | Cur6 | Cga1 | Cga2 | Cga3 | Cga4 |
| Pois | Blind | Para | Slow | Silen | nPoi | nBln | nPar | Erase | nSil |
| Stn1 | Stn2 | Stn3 | Stn4 | Stn5 | gSt1 | gSt2 | gSt3 |
| Wtr1 | Wtr2 | ... etc etc etc.

I also like the color idea. Would be cool to have different colors for different macro buttons. Like one color for JAs, another for WS's, another for spells, etc.

If anything though, I'd like more text space in the macro buttons.