I think it would add to the excitement of sumo tournament matches if each tier (1-10) had a different background image that would visually cue advancement. If ten backgrounds would be a lot of work, then you could either recolor them along a spectrum (say, from grey to blue to gold), create fewer backgrounds for tier brackets (so one for matches 1-3, one for 4-6, one for 7-9, and one for the final), or open it up to a design competition among players to submit their own.