a cottage garden and a vision

we have this little grass nook beside our garage that is pretty much a useless space. finally, we bit the bullet and bought some beautiful cobblestones to lay down a cottage path. after some strenuous work, i managed to fit all the rocks into place and am so excited about the results - and it is only half done! next comes the hard part - planting the ground cover in the cracks. i am hoping for a fragrant, hearty plant that is above all, quick growing. any suggestions???