Hi,
Create a new folder in PCManFM : right click in the middle of right part, first menu : New → Directory.
Get the thumbnails : display your images in any image viewer, go to the .thumbnails directory, browse there and see if the thumbnails stocked there fit your needs.
:-)
If not, you can use "convert" from the ImageMagick suite, with a
command script such as:
#!/bin/sh
mkdir modif
for i in `ls *.*`;do convert $i -resize 48x48 modif/$i ; doneYou change the value "48x48" with what suits you. This is in pixels.
I just figured out how to get this to work in thunar. I had to install thunar along with a few plug-ins. 
Which ones ?
