Those are all solid ideas.
My biggest gripe was that some of the computer/monitor screens featured drawings (which were lifted from Marvel's #1, I think). Having drawings punctured the "fourth wall" created by the command center's environment.
If you're going to have any images of characters, I'd start with photos of actual toys and then run them through some kind of photoshop filter.
For example, if you wanted an image of a character appearing to be "on screen", go for something like this:
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