Anything to do with electronics/cars/sports are usually good ideas. Otherwise, although a gift card is not very personal, try to find where they like to shop and see if you can get them a gift card for that store.
One could find gift ideas for women by visiting websites such as Amazon or eBay and look in the women's section. This will give you some idea on what to buy.
www.thegiftinsider.com is a great site to look at to find perfect creative gift ideas! Also try related sites. You can search related sites or watch the Homemaker channel on your television for great gift ideas!
Men are so difficult to buy things for. I would suggest a gift geared toward something he likes to do. Even a date night with dinner and drinks would be romantic if he is that kind of guy. There are several websites on the internet you could search that will give you some ideas for gifts. www.gifts.com/boyfriends has a few ideas for you to choose from.
Cards and flowers are always good as gifts, no matter the age. Get them a gift card for a place they go to regularly or for a relaxing massage. A gift they can use.
For a gymnast I would give a gift certificate to a store that sells gymnastic tights and suits. For stocking stuffers you could give a girl gymnast some hair accessories.
I have some links to a couple of websites that could give you some great ideas for some gift baskets. You can purchase from them or simply use theirs for some ideas. www.gifts.com and www.alyssagiftbaskets.com
Good gift ideas for a female boss are gift cards to restaurants or gas stations. If they like coffee, you can give them a gift card to a coffee shop.
There are several places one could go to find a unique birthday gift. Online stores, such as Personal Creations and UncommonGoods, are known for marketing personalized, unique items one could give as a birthday gift. Think Simple Now, an online blog, also has a list of ideas one could use for a birthday present.
You could give an iPhone as a gift. It begins with the letter i.
I love the gift ideas for the 50th birthday on www.squidoo.com/50th-birthday-gift-ideas as it has some unique gifts. The special collection includes gifts from 50 years ago like newspapers, candy and even coin collections. Everything on this page is "50" years old.
If you want a unique gift for your girlfriends 21st birthday, you can go to www.ugiftideas.com/girlfriend. This offers around 100 ideas to choose from, so you will most likely find the perfect one of a kind memorable gift.
First you have to know what gift you wanted to give to your sister. Like consider what are her interests, then you can find them on the mall or try pinterest to give you ideas if you don't have.