This two part mounting plate has room for an Arduino, a full-size breadboard, and a tray for component storage. It also features a resistor color code reference.
Build it with bamboo: 3 ply for the top part (protoboard_3plybamboo_p1.eps) and single ply for the lower (protoboard_blondebamboo_p1.eps). Glue the pieces together, making sure the bolt holes in the top part are centered with the nut holes in the bottom part. Mount your Arduino with M3x12 bolts, and your breadboard with double-sided foam tape.