Those look nice. Personally, I like solid colors, so that is what I would go for. I would need some better pictures to decide if I would buy them. The price is VERY appealing.
As for marketing them, first and foremost, get better pictures. The collars alone should be on a blank, or as neutral as possible background. When modeled on dogs, go for painfully adorable short haired models, if you can find a willing participant. Short hair makes it easier to see the collar without the distraction of your hand in the way.
Once you get a good model base, with sizes and color samples, you need to get your product out there. Hit the vet offices, mom and pop pet shops, grooming salons, specialty treat stores, and of course the local shelters.
This is a good idea and a good product.
When you get a little money saved up, you might want to consider investing in a small engraving machine and offer tags with the collars too.
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