We've done Bionicle mosaics before at conventions. CF and Nukaya have made Kopaka, Onua, and the full team of Toa Mata at BrickFair, and we've done the Kaukau Waterfall and Lewa-in-Protodermis at BrickCon. But so far none at Cascade, despite a fairly good BZP turnout. And with Bionicle's return, we could even design something that is maybe not ten years old!
One idea I have is to do an image of the island of Okoto. This would require a substantial amount of blue for the ocean, but for the most part the other colors aren't rare. (Although rarity varies by collection, I guess.) Another option would just be to focus on a single character's headshot, which is possible, although we might have to substitute gold for yellow if we do Tahu, Kopaka, or Onua. But the new style of animation allows for pretty definite color zones, so it would be relatively easy to generate something compared to other styles that have actual shading on the characters (which requires more brick colors in mosaics.)
The general idea would be to make a 96x96-ish stud mosaic, large enough to capture the eye of passer-bys. That's a hefty amount for a single individual, but when if you split it up into 32x32 baseplate sections, it's more manageable. Then we would need 5-9 builders to contribute. (I can always do multiple plates, since my basic brick collection has expanded since I started practicing with mosaics.) But we need interest and at least a low level of commitment. That's failed to materialize in the past few years so that's why I'm kinda pessimistic about this happening. But if you are interested, post here saying what picture you'd like (as well as maybe what colors you would work best with.) If we can get enough people interested in a single idea, I'll draft it up, provide pieces to claim, and hopefully give y'all enough time to build it and/or Bricklink any parts you might need.
And since I'm talking collaborations... I'll be putting up a black light display at Cascade, but I only have one decent Toa-sized model to put in. If somebody else has a similar Toa-sized design that would look good in black light, perhaps we can make a scene. Granted, the display is probably only big enough for 3-4 Toa, and it would be cool to have multiple colors. Mine's in medium trans blue, but trans neon green and trans neon orange also work well. (Granted, for masks you'd probably want either the TNGM or the trans orange Kaukau. I'm using the misprint light blue kaukau. I don't know of many other masks that glow, unless you happen to have the trans orange Hau new Tahu mask.) I'd like to make my own, but I don't have the inspiration to pull that off at the moment.
So what'll it be? Any takers?