Used the plans for the Arts & Crafts Play Table, but ditched the angled legs (the squared off legs have no stability issues at all), and used a regular piece of 1/4" fiberboard instead of acrylic for the lid. On the lid I glued a 15x15 LEGO baseplate, and compartments underneath are for LEGO storage. The local REStore had an 8ft length of 3" laminated MDF trim for $2, which worked perfectly as the trim for the top of the table with no sanding or painting required.
I know the paint in the photo looks super-streaky, but I used some leftover Rust-Oleum cobalt blue metallic floor paint, so it's shimmery and glossy. Unfortunately the visual effect photographs poorly.