Microgreens are any veg you fancy, but cut and eaten at baby leaf stage. You can use any seed, it doesn't have to be 'special'.
At this time of year I often sow seed left over from last year, in small seed trays of compost, on the kitchen windowledge. It's often mustard, cress, or brassicas, even peas left to grow a few inches tall, taste wonderful.
Give it a go...