Remember the rhyme scheme of ABaAabAB
Try writing a triolet using "slant rhymes," or rhymes that "look" like they rhyme but don't quite, such as where, were, wear, we're, etc.
Write a triolet where "A" and "a" rhymes are slant but "B" and "b" rhymes are true, such as knew, clue, few, etc.
Write a triolet where all the rhymes are multisyllabic
Write a triolet where all the rhymes are monosyllabic