[quote name='jshackles'][CUSTOMSPOILER=Snip]At least from the people I spoke to, the reaction was overwhelmingly positive. They said things like "We really like to see people able to interact with Steam in cool new ways". The one feature I thought they would grill me on was the pricing history, but that didn't even come up. Now my next new feature, they may not like so much.... let me explain.
I don't like paying for profile backgrounds. Or, subsequently, collecting cards crafting badges etc so I can make cosmetic changes. So I decided that Enhanced Steam can help.
Basically, you can set a separate (free) profile background that will show up for people that are also using Enhanced Steam. Anyone not using Enhanced Steam (or just using the client) will see the profile you set publicly (like normal).
For now, it will just include the profile backgrounds that Valve has. You can't upload your own. But you can choose which one you want and have it display without paying for it. And if you want your friends to see your profile the way you do, you can have them install Enhanced Steam.

[/CUSTOMSPOILER]
What do you guys think?[/QUOTE]
Ouch... That sounds like it may be a problem to me. If you give people the option to use the backgrounds that people are paying money for, that'll piss some people off for sure.
On the other side of the room, if you make it so that people can upload their own picture, I would see that as not being a problem, for you at least, because people will upload what they want, and if it happens to be stuff that Valve doesn't like, that's their problem.
To me, it sounds like you're setting yourself up for a bad situation. I'm not sure how Valve feels about those backgrounds, but I wouldn't step into that scene if I were you.
To protect yourself from a possible lawsuit (I have no idea if Valve would take it that far), I would avoid the profile thing outright, or at least make it so you're not liable for what the people who use your extension do.
EDIT: Talking to spoder about it, now I realized that people already do this for TF2 hats, so I dunno if the they'd have a case, or if they'd pursue it, but I still believe that it'd attract unwanted attention from them.
Spoder agrees with me in that you should probably just leave that feature out altogether. It could get messy. =/