No guild of fine artists? That doesn't mean the creative side of the community isn't doing anything. On deviantart there are several Myst/Uru groups and (currently) the most active one is holding a contest!
The Myst-fanclub's Make one- Share one comptetion has been a very succesfull contest in the past and the idea is simple
In Make One, Share One participants will create an art piece representing a character or element from their favorite Myst game. This can be in any visual media except animation or literature (drawings, paintings, models, embroidery, woodwork, bead work, etc. are fine). This is an opportunity for members to stretch their creative wings and to provide awards for future club-sponsored competitions.
The deadline is 21 May. See the link below for more information. To participate one must be a member of Deviantart and of the group, both are free >.>