A photo with a white background would be perfect. Have a look at some of the existing images for the sort of style I think works best.
For the devices already on the wiki, we have one page for each model - so one page for a Sound Blaster 2.0, one for an SBPro, one for SB16, and so on. Some motherboards are offered with different options (e.g. onboard audio or not) so for these we will probably have one page for the motherboard model, with (hopefully!) one photo of each variant (onboard audio yes/no, onboard video yes/no, etc.) and some text explaining the different options available.
With this in mind, what would you think would work best for CPUs? How about one page for each model (PII/300, PII/350, etc.) with different steppings/revisions listed on that model's page?
The answer to this question probably hinges on the device lists on the wiki, which are supposed to list all the devices and compare features between them. For example the list of sound cards shows which devices have a CD interface and which will work in an 8-bit ISA slot, so if you are looking for a sound card to run your CD drive or to go into your XT, you can use the lists to find suitable candidates.
I guess if you are looking at a list of CPUs, you want to know which CPUs will work in a motherboard you have, so key attributes would be things like the socket and the microarchitecture codename. I don't think these change within the same CPU model, so one page per CPU model (with all the different revisions on that one model's page) should just about cover it, right?
What other attributes do you think should be recorded for CPUs? Cache size, bus speed, architecture, register size (32/64bit), little/big/both endian, address bus width/maximum addressable memory...what else? Power use? I'll create an infobox for CPUs with these attributes then do up an example page, and if you think it covers everything then you can just copy and paste it and change the details for each CPU model you add. Hopefully that will make it easy!
I'll have a think about the best way to code this up. It'd be nice to be able to show an automatically generated list on each motherboard's page of the CPUs that will work with that board. Or maybe even each CPU's page could have a list of motherboards that will run it...
@brassicGamer: Thanks for the kind words!