GIMP version 2.4 or higher supports the Photoshop .ABR brush format! Files must be copied to the directory /gimp-2.x/brushes/ (where x=version number) or /usr/share/gimp/2.0/brushes/.
Here we have some nice floral brushes.
If unsure where to go during the summer vacation, I recommend to visit Hungary, and just in time to be tours in Budapest is not to be missed. A huge number of attractions that everyone must see. So, hurry to book a ticket and visit this wonderful city.