My husband is a very keen cook, so I like (or rather NEED) to grow lots of thyme for him to use in his cooking. I kid you not, he uses a large sprig of fresh thyme if not every night, then every other night. As 'head gardener', that is quite some pressure!
It is very easy to grow from seed. Thymus vulgaris is what you would normally look for.) I've got some coming up right now in a half tray. The best thymes for cooking tend to be those that produce little or no flower. If you're not fussed about using it in cooking you can get varieties with purple, pink or white flowers. If it's purely for decoration it would pay you to seek out a specialist grower. If it's for a path you need the 'creeping thyme' varieties that grow low. Have you looked at the specialist seed growers such as Nicky's seeds http://www.nickys-nursery.co.uk/ ?
I don't know where you live, but if you're anywhere near Laurel Farm Herbs http://www.laurelfarmherbs.co.uk/ they are very good with herbs for culinary use. We bought a rosemary from them once which had fantastic flavour and had the most amazing blue flowers, but we left it behind when we moved house, more's the pity.