Hang a few windchimes. If you have a mail box, plant a climbing flower around it (morning glories are nice). Add monkey grass along the sides of the driveway. It fills in nicely and people often give it away for free.
Always accept plants and cuttings from neighbors, friends, and family. This is a nice way to build up your garden without cost. Often you can buy flower and vegetable seed packets at discount stores very inexpensively.
Create a little sitting area with a table and chairs. You can dine al fresco or just sit out there to enjoy the fresh air, watch the wildlife, watch the sunrise or sunset, or read a book with a refreshing drink in hand.
There are all sorts of things you can do outdoors to make the area both functional and beautiful. Be creative and have fun with it!