The most indolic thing I've ever smelled was Neil Morris's Zephyr. I enjoy my indoles, but this was RIDICULOUS. If you've ever had a kitchen sponge go really really bad, Zephyr is like a concentrated version of that.
But if you want a clear idea what indoles can do without being prettied up by jasmine or anything (there's a bit of citrus in the top, but it's kind of like a cruel joke, fooling you into thinking this frag is going to be fresh before the indoles grow and grow and grow...)
I should state, though, that I sampled this at Takashimaya from their sample bottle, which may have been off. Other reviews here compare it to strawberry shampoo (!?!?)