I totally LOVE the two collars my Master and I have designed together.

The mint collar actually has white stitching now. It was an error by the creators, but their customer service is crazy good and they fixed it pronto. This one is my everyday collar. The spacer ring is gorgeous and classy looking, and it's not a very obvious collar. I feel completely comfortable wearing it in public.
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(because this is the first time I've attempted to attach pics and who knows xD)

The pink collar... was a total splurge on my behalf. I saw the crazy leopard faux fur lining and I just had to have it all of a sudden xD It says "snuggle kitty" which is one of my Master's adorable pet names for me =^_^=. It's not really designed for public wear... it's got a great soft, furry lining, and makes me feel all warm and cozy. I wear it almost all the time in my apartment, and have been known to sneak out to the library in it, especially when it matches my outfit, it's just too adorable.
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My plans for my next collar are as follows (I'm a total addict, for the record):
13" long, 2.25" wide (for a warmer neck!), black faux fur on the inside lining, bottom layer outer lining black faux fur, top strap midnight purple. The thought is that it will kind of look like a big warm furry thing around my neck, with a leather strap on top, and I'll be wearing the buckle in the front, as a sort of decorative piece... I included the generated image by the customizer on CollarFactory.com
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I love collars... I don't think I have a dream one xD How would I choose! Master and I will probably design them for all kinds of fun occassions >_>