Lots. Dragonair, Floette, Bayleef, Braixen, Ivysaur, Wartortle, Kadabra, Haunter, Rhydon, Flaaffy, Vigoroth, Numel, Scraggy, Zorua, Axew, Rufflet, Deino, Fletchinder, Skrelp, and Sliggoo all look better to me than their evolved forms.
An unnecessarily long list, but I was bored. And TC did ask. For the record, Braixen is the only one I flat out refuse to evolve. The massive ear hair is very off putting, and I don't feel like I'm missing much competitively.
Currently playing: Fallout 3, Fire Emblem: Awakening, Dark Souls 2, Far Cry 3, GTA V, FTL, Pokemon X/Y FC: 2337-4234-3045, TSV - 2385