I'm a believer in the "big knife, little knife" philosophy. If it's just opening some mail at work or trimming a stray thread, I go with the Spyderco Ladybug on the keychain. Very convenient.
Ah yeah.. in slacks I have been using my little Dragonfly, and in jeans anything goes. I bought a Purple Ladybug for my girlfriend and was going to duracoat the blade pink and engrave her initials in the blade. But the knife is SO small - smaller than I expected. And for her, the intended use is going to be "small enough to go in her small handpurse thingy, and big enough to defend herself", so I ordered the Purple Delica with the same Duracoat project in mind.
Also... as far as duracoat - now that I'll have the WHOLE Ambitious-Persistence-Tenacious-Resilience lineup... I may duracoat all the blades black and the steel liners a dark plum purple - leaving the G10 black grips as is.