i have just started modding and i got 6 windows with mesh til now. I have picked up lots of ideas on what kind of style and windows and cut outs and what ever the hack you want to do with your computer.
This site helped me a lot (it is the best modding forum on the web, lol):
And this is a site of an pro modder who sells stuff and makes the best custom computer i have ever seen! Check out his gallery, it has the sweetest things in it, but if you want to see the worklogs of his creations go to the website above. He posts stuff there, too.
Browse those sites and you find pretty cool mods you have never even heard of!