If I could, I would replace all my grass with thyme.
I have seven different cultivars growing now, with outstanding features like lemon and pineapple flavours, variegated or brightly-coloured foliage, and creeping or bushy habits. I can really never have enough thyme.
My plants that need a little winter protection over the root ball are often planted under a bed of thyme, allowing them to be insulated during the colder months: tarragon, for example, springs up reliably every year from underneath a patch of golden thyme.
Under foot and between paving stones, thyme holds weeds at bay, and releases a sweet scent into the air when stepped on.