I've always wanted there to be a Poison and Bug Eeveelution.
I based the Poison one on the saying "Cute but Deadly" as well as a hypnotizing cobra/scorpion
The Bug one is simply based off a silk spinning insect. I wanted to keep the design as simple as possible, but I'll probably add some sort of pattern on it.
Lureon - poison
The hypnotic PKMN
Lv. up Eevee with a poison barb
The pattern on Lureon have a hypnotic effect on anyone who stares at them. There have been lots of cases about trainers blacking out after encountering them.
Weaveon - bug
The silk walking PKMN
Lv. up Eevee with a silk scarf
Weaveon are often thought to be floating. however they lack the ability, and they are actually walking on silk they've spun between objects.
I'm tired so I'm just gonna go to sleep...