Here's what rhymes with indigo.
go ago co goe ko no so know though low show grow row tho fo foe glow ho lo quo undergo bo doe dough mo po ro toe wo woe crow tow yo beau ceux faut hoe jo sew soe uno vo aglow beaux cho dau dicho mow noe roe sho yeux zo dunno rho tarot turbot whoa doh kayo pekoe below flow blow slow snow throw pro embryo plateau fro chateau hello thro bio propos tableau aliquot floe medico tableaux topos tuo bro chateaux plateaux stow throe trow kapok sloe undertow gateau gateaux borzoi schmo schmoe although audio bestow buffalo patio portico bungalow calico dynamo forego forgo nouveau polio vertigo apropos cameo domino escrow outgrow siglo afterglow trousseau chapeau oleo piccolo deathblow overgrow regrow bandeau matzoh pompano chapeaux trousseaux resew ratio radio overthrow studio overflow folio stereo politico mistletoe rodeo spatio adagio foreknow fatso romeo tallyho oregano pistachio mustachio microdot moustachio archipelago presidio impresario portfolio braggadocio pianissimo generalissimo