I think the return of favorites from the original trilogy soundtrack, even if the tracks are slightly updated for MEA, is one of the simple, obvious ways to make MEA feel like Mass Effect.
No matter how much people may hate on Assassin's Creed for its repetitive, underdeveloped production values, the soundtracks are a good example of this. AC2 had a stellar soundtrack and introduced a beautiful theme. Every game since has carried on the tradition of high quality soundtracks and and "era appropriate" take on that AC theme introduced in AC2. It's become very iconic.
Fresh, but recognizable, versions of existing tracks could be pretty sweet. Unaltered originals would likewise be great.
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Dr. rotinaj et DextroDNA aiment ceci