I'd incorporate more fun colors and some caramel toned wood instead of the scrubbed pine, but I like it. (Refined Linen + Velvet textures mixed with scrubbed pine - natural finishes and rubbed iron lighting, add flair to this neutral space).
Double balance beam obstacle course idea - have students cross two balance beams like shown in this picture - tell them to pretend that the floor is a river filled with crocodiles! Or lava! You could also use two long folded panel mats.