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While this is a pattern for a potholder, it could be used as a motif used for something else; the two-colour spiral is attractive in its own right.

Scarf with luminous sections outlined in black, as if it were a stained-glass window.

A fun idea, to make crocheted 'daisies' for making daisy chains

This looks very cool, though I'm not sure how practical it is.

Crochet spiral in THREE colours, rather than one or two.

One side is one colour, the other side is the other colour, though each colour can show through a bit on the opposite side.

Multi-coloured textured stitch with staggered spikes.

An unusual ripple blanket pattern; the zig-zags alternate between small and large, making it, as the author says, wriggly.

Now this might tempt me to actually do Granny Squares.\n\nThis is like classic Granny Stitch except that the middle dc is done as a spike into the dc two rows below. This closes up some of the gaps, which makes it more attractive to me.

Tutorial for a simpler two-colour crochet cord; with this one, you just chain alternate colours.

Crochet cord tutorial, using two colours of yarn.