When the lights come on in Toyota Center on Sunday, heralding the return of basketball with the Rockets’ annual open practice and related festivities, Houston’s home will shine brighter, with new rings of lights circling the top of the lower bowl like a crown. But that is just the start of renovations and upgrades underway or planned for the arena. The projects will range from enormous in the center of the arena to smaller and more subtle, costing $30 million to start, including last year’s upgrades to the club suites, and to bring a refresh to the arena that on Friday marked 20 years since it’s opening night.