Ken Saunders has created Firefox, Thunderbird and Mozilla snow globes. All three designs come in either a static PNG or animated (Firefox 3 or Opera 9.5) PNG format; choose from 125×125 or 200×200; with or without Happy Holidays.
More Firefox themed holiday decorations including wall papers and ornaments can be found at AccessFirefox.org. All graphics are available for PC, Mac or Linux.
Source: Mozilla Links