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The blue oval is indeed an addon, but most likely a very simple one that should be easy to code (don't look at me, I don't know nuthin' 'bout LUA!), however the yellow outline arround buttons is default Blizzard handling. It shows whenever there's a proc active that improves a particular spell. For example, when warriors get Sword and Board, the Shield Slam icon gets highlighted. Arcane Missiles becomes available for mages, that button lights up. Nightfall procs for an Affliction Warlock, and Shadow Bolt goes fireworks. And so on and so forth.
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