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You were assigned a random avatar when  you got here. You can edit it under your Account menu>Settings (top right).

I was assigned a lovely yellow thing, which I intended to keep, but they have now either removed those plain color (diamond?) avatars, or they go away once you climb community levels. I would expect a larger number of alternatives to serve some hundred thousand users... there must be thousands of user with the exact same avatar.

The one and only perk with these forums is the ability to quickly and easily add images straight from our computers. It took a few tries to make this a size I like, but now I just add it to everything I write save my own story where it would feel wrong. 

Similarly the signature is done in word and saved as an image on the computer. Easy to do and easy to use. I refuse to let someone else dictate what I can and cannot use as an avatar and I missed me when posting. It's a bit annoying to remember to do it manually each time, but at least this way I'm me. I hope others catch on as well because I miss seeing who people are. 

SheriSim  you have to click on your icon in the top right corner, go to settings. On the tab personal you have a small selection to choose from. With so many simmers on this forum, there are bound to be others with the same one but it's better than nothing. There is a plumbob among the options, I assume that's what you meant with sim diamond.