For something on the larger scale, you can always personalise a planter as a gift. Make your own by using a small wooden crate—you might be able to obtain one for free from your local supermarket. You can line it with a plastic bag cut along the side and laid flat inside.
This will stop any soil from falling through. Paint in bright pastel colours or stencil a message on the front and then plant it up with her favourite flowers. Or, instead of using it as a planter, it can be used for storing garden knick-knacks like gloves, hand tools and twine.