Avatar:

13 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairav.png

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Banners:

400x300, 54.3 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairbanner400x300.jpg

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400x300, 74.5 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairbanner400x300trans.png

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500x100, 32.9 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairbanner500x100.jpg

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500x100, 37.1 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairbanner500x100trans.png

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Logos (for blogs and content blocks):

200x200, 32.1 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairlogo.png

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300x300, 47.9 kb

http://www.brickshelf.com/gallery/B-f-a-home/BohrokFair/bohrokfairlogolarge.png

Full gallery available here.

Remember: pay attention to the file sizes!

(Also Bfahome is amazing - Sisen)