i know a lot of links but all require fill form for registration ,authentication of registration, log in and so on...no time for that
I need just images with large transparent area and good quality, subject is not too important

Well here's a PSP tube site. They are what GIMP users call renders.

Some are compatible with GIMP and some are not. Depends on the version of PSP used.

You don't have to register to get them and this person does an excellent job. If there are some you want really badly that won't open in GIMP, let me know. I can open them in PSP and convert them to png images.

Scroll down on the web page for categories.
http://www.jcwdesigns.com/tubeindexjcw.htm

thank O , nice side

I have PSP 13, so I can help with tubes as well.

Why don't you just join Planet-Renders?
http://planetrenders.net/renders/
Sign up once and you have access to 19,839 renders. =)

I dumped PSP for gimp ages back. I didn't think PSP tubes were compatible with gimp. I just threw away 4 dvds full of them

PC, you can also fire up your favorite search engine and look for C4D. That's the abbreviation for Cinema 4D software, which makes many abstract renders that seem to be popular in signature images.

Once tubes are converted to .png files, you can use them in GIMP.