What we love about tire planters is that the opportunities really are endless. You can go as basic or as elaborate as you want, and you don't even have to use real flowers if you don't consider yourself to be very green-fingered. But if you do want to get real plants involved, we'd urge you to go as colorful as you possibly can. This way, your tire planter will really stand out from the crowd.
Elevating your tire planter from the ground will also help to prolong the life of your flowers, as this extra height will allow for excess water to fall to the ground.