If you're not sure what to give, why not let them choose for themselves?
When you purchase a digital gift card you receive a code by email that can be used at the checkout for the value you selected.
Because they are a digital product, the value of Gift Cards does not count towards the order value required for free shipping.
If you buy a Gift Card as part of a larger order, it will be issued after we have picked the whole order. If you want the Gift Card quickly, place them as a separate order.