Hee hee this is a good thread, thanks for making it!
Cinnamon Breeze, I agree! I'm thinking... Cinna-bun
Lavender Cloud (what is this name, seriously? She has no lavender and the cloud isn't even the most interesting thing in her cutie mark!) should be...hmm... Pastel Pinwheel or Pinwheel Surprise.
Other names I would change:
April Mist (cutie mark is an umbrella...) = April Showers, duh! "April showers bring may flowers" everyone knows that
August Breeze (a lot of these birthstone ponies got poorly named...) = August Seashore or August Shoreline
Blushie (another name I don't get...) = Pale Rose
Cute Curtsey (bleh!) = Carriage Racer or Ribbon Racer
Jade Garden (you don't get to be named Jade if you're not green!) = Flower Fall or Flower Cascade
Pearly Pie (your name makes no sense, ms. pegasus) = Mango Blossom
The winter ponies suffered most horribly when it came to names! They get their own section:
Snow'El #1 = Mittens (yeah not so original, but every time I look at her that immediately pops into my head. Plus the awesome name of Snow'El should definitely go to the pretty white pegasus!)
Mittens (FAIL! YOUR CUTIE MARK IS A CHRISTMAS TREE!) = Pink Noel or Tannenbaum
Mistletoe (you could've got by with this if you came with some as an accessory...) = Power Soft (for her white color)
Toboggan (nice name if you didn't have a snowflake on your butt!) = Snowdrop
Sno-Glo (what does that even mean..?) = Gift Giver