You can put link= in the image and it will link the article when you click the image. I did it to Template:AllWeKnowisFallingHead but not sure if this was intended. You can do it to the others if you want.
Well, it all depends. For this wiki I spent the whole day looking for good strings of codes, but I can find what your looking for if you want, like if you want to change the cursor and all that. As for the background, I used the Admin Dashboard to change it's transparency. On the Community Wiki there is a tutorial (http://community.wikia.com/wiki/Help:Editing_Special:CSS) but it honestly sucks and does not help you what-so-ever.
Of course you can join, it's great to have a new user after a while! You can help by editing, we have many links for that in our homepage! We're a loyal and loving community to new users and we all love Paramore! If you want to continue talking, you can always reply back! If you have any questions, don't be afraid... ask away!
Your welcome! You can see all the pages by going to Special:AllPages. You can edit any pages you want, just expanding it or correcting it really makes a difference! If you don't know where to start, a list of short pages can be found at Special:ShortPages .
If you have anymore questions, you can just reply!