Here are other G1 ponies that don't neatly fit into the other categories, including a lot of mail orders
Ember (Blue) Ember (Lavender) Ember (Pink) January Carnation February Violet March Daffodil April Daisy May Lily of the Valley June Rose July Water Lily August Poppy September Morning Glory October Cosmos November Crysanthemum December Holly Hollywood Lucky Stockings Satin N Lace (SS) Satin N Lace (light) Satin N Lace (dark) Coat N Tails Baby Blue Ribbon Clipper Dabble Scribbles Lil Cupcake Lil Sweetcake Baby Blossom (Pearlized) Baby Cotton Candy (Pearlized) Baby Firefly (Pearlized) Baby Glory (Pearlized) Baby Moondancer (Pearlized) Baby Surprise (Pearlized) Baby Gametime Baby Sugarcake Sweet Scoops Baby Dancing Butterflies Baby Love Melody Baby Milky Way Baby Sugarberry Baby Sweet Tooth Baby Up Up N Away Goldilocks Rapunzel Mail Order Mommy Mail Order Baby Lil Tot Baby Stockings Baby Chuck E. Cheese Pony Valentines Day Mail Order Pony (White) Valentines Day Mail Order Pony (Purple)
Baby Ember is a mail order pony who came in several different color variants. The pink variant has pink fur and purple hair. The one I have originally came to me with a scuffed eye, and I repainted over the eye to fix it.
Baby Chuck E. Cheese Pony is a pink pony with blue hair, and the Chuck E. Cheese Logo as her cutiemark. She was availible exclusively as a prize in Chuck E. Cheese resturaunts. She is my favorite pony of all time, so I made sure to order a good condition one (She is probably the most expensive pony I've bought so far).
The Valentine's Day Mail order ponies are two little baby ponies that were only availible through Mail Order. One is white with vibrant red hair and a red heart cutiemark. The other pony is purple with pink hair and a pink heart cutiemark. She is also a first tooth pony. I found both of these guys in perfect condition at an antique store. Since they have the same name (Valentines Day Pony), I have nicknamed the purple one Valen and the white one Tina.