Any suggestions for a nice Wallpaper

look on deviantart. there's lots of awesome stuff.

Using this, but the red version.

This

boobs

wallbase.cc

interfacelift.com

should solve it.

Stating preferences and personal tastes/hobbies would help. For now you get this. :D

These are some of my favourites. Wallbase.cc is also a nice place for wallpapers.

I have the third to last wallpaper from here: http://windows.microsoft.com/en-us/windows/zune-characters-download-theme

http://windows.microsoft.com/en-us/windows/beach-sunsets-download-theme

this is my favorite~

Microsoft has some official space related themes I use on my desktop (Spitzer, Hubble, and an art one)

here
here
here

I use the first two together (and used photoshop to get rid of the watermark), screenshots rotate every minute or so.

I use this on my laptop

I'm using this for now, it's so cool.

PD: How I can post links properly?

Try 'Wally' it gives you a new wallpaper every day...apparently. I haven't tried it yet.

http://wally.en.softonic.com/

I really want something colorful or something that includes the universe or etc.

Pixiv,
CgHub (has some NSFW)

Anything with boobs...

This.

I usually use some nice gaussian blur gradient wallpapers. I like neutral stuff because I also use rainmeter and sharp images, like scenery get in the way of using rainmeter efficiently.

The only wallpaper you'll ever need