I have nothing against the guy clothes that are out there-- I subsist primarily on cargo pants and button-up/polo/T-shirts in varying (often BRIGHT) colors on a day-to-day basis. However, sometimes the selection is pretty limited. I like spicing things up with fun ties/scarves/bandanas/jewelry (male or female, doesn't much matter to me-- my earrings and necklaces are a mishmosh, gender-wise), bright colors, hawaiian shirts, vests (argyle sweater vests = favorite), etc. ...sometimes I'll even cross the gender boundary entirely and don a gypsy skirt or blouse (though that is obviously less of an option in situations where passing is necessary).
Colorful footwear is another thing I've found that makes my wardrobe more exciting. I've always loved colorful socks (I wear women's socks because they're more comfortable and colorful... and honestly, who cares what gender my socks were made for?), and I recently obtained a pair of purple Converse shoes, as well as some black tennis shoes which I immediately decked out with rainbow laces.