There was a time when I put in the extra effort for my themes. I would go hunting for fanart all over the internet trying to find the right image to then edit and make a tag and / or icon on Photoshop. More times than not, I would have had a matching avatar to go with my signature. To me, a matching avatar and signature always felt complete. And if I really liked it, I would usually keep it for awhile, but in some cases I would change my theme almost every week or every other week.
Now, however, I'm different. I don't try as hard to make it look finished and sometimes my avatar and signature have nothing in common. More often than before, I usually prefer to borrow work from other artists instead of putting in the effort to make my own. I know I've used work from TwilightBlade, Dez, Aizuke, Loki, and a few other graphic designers here. I guess you could say I got kind of lazy in the graphic design department. Although, there are some times when I at least make my own avatar, since that's typically pretty easy compared to full blown tag for my signature. I don't really change up my theme as often anymore either. Now it's usually almost once a month before I find something else.
Like TwilightBlade, a good theme always motivates me to post more.