At their PAX booth this year, Double Fine will be selling two Day of the Tentacle: Special Edition posters signed by Tim.
This new Mojo that you guys paid for doesn't seem to be able to let me upload images, so check out the posters on the Double Fine Action News instead
It would be cool if these showed up at the company store some day, but there could be rights issues involved with that. I believe a similar legal snag has held up the release of the Grim Fandango Remastered soundtrack..
Source: Double Fine Action News