I've been pretty stuck on black shoes lately especially slip ons. I already have one, and for me it's still a good purchase even tho it's quite a splurge.I really like how you can dress quite formal and sleek, but when you pair it with slip ons, it gives you a cool edge to your look (+ oh its so comfortable!) For me, this DIEMME slip on is so cool. It's exotic leather gives a nice touch of detail.. (plus it looks expensive hence the price tag) and you can never go wrong with black really.
For affordable options, you can get it from jeffrey campbell or vans (they hv the beatles and star wars prints!) even from marc by marc jacobs. For the expensive ones.. my faves would be from givenchy, common projects, mother of pearl, or the holy grail.. CELINE.