For me personally, it would be getting my hair foiled with high and low lights by a really good stylist every 8 weeks or so and having my eyebrows waxed by someone else about every three weeks. Both are pretty expensive and I guess are a luxury and have to be done on a regular basis to keep looking good, but are two things that I don't want to skimp on. There is no way to hide messed up eyebrows -whether bushy and out of control - or over or unevenly plucked or a head of hair that has either a bad home perm or horrid dye job gone wrong or just a bad hair cut.
I may be adding a pedicure into that rotation every once in a while. All the time I spend clomping around in the mud and manure and wearing rubber boats and just taking a beating in general my feet are not looking so great anymore. I bought a special pedicure package for my mom for her 75th birthday last week and she had some pretty nasty looking feet and toes and they look wonderful now. The work they did was amazing.
The other thing might be Caribu Coffee. It is stupid to spend 4 dollars on a specialty coffee drink when I could make a bunch of pots of coffee at home for that price.
Another thing might be all the movies we go to. Probably 2-3 a week depending on what movies have opened. Sometimes just my husband and I and sometimes with all the kids but no matter what, by the time you buy the tickets, the soda and the popcorn it is a lot of money for two hours of entertainment.
Boating is becoming a luxury with how much gas has jumped - if you are paying $2.65 at the gas station for your car, the marina selling the exact same gas to boaters on the lake charges close to $4 a gallon. Adding up the gas for a day on the lake, snacks, drinks, water toys, etc. It is less than what would be spent going to a show for the weekend but is still a significant amount.
Other than that stuff, I've always liked to read but it isn't like I buy a lot of books. Somehow we've accumulated a lot of books over the years and I have a lot that I want to "read some day". That day will probably come once all the kids are older. My mom does buy a LOT of books and passes them along to me when she is done.
Thinking to when I'm out shopping and what I buy, beyond groceries and neccessities I am usually more interested in buying things for my kids than myself.
We need to do some painting and cosmetic work in the house and I want new living room furniture, but it is hardly a luxury since it has been years since we really gave that much thought or attention and with our active kids the walls and furniture have all really taken a beating.
I always encourage my husbands hobbies and interests and if he sees something he really wants I tell him to get it so that I don't feel so guilty when I want to buy more horse stuff.