Here are the ideas:
You could just hot glue thematic icon buttons to clothespins and place the clothespins in areas around your room. This would allow you just clip new cards very easily each week.
Another idea is to place background cards throughout the room and then attach the cards with Velcro.
Or you could do both a background and clothespin with thematic icon button. This is how I will display mine throughout my room. I will probably do a Write the Room for Math Centers, too and will just put the math card behind the word card. I could have a student helper switch them out for Math Centers.
The themes include: oceans, pirates, ladybugs, stars, Hollywood, apples, bees, beach, jungle, owls, crayons and pencils. The background cards come in two sizes, and the colors include red, blue, green, yellow, orange, purple, pink, black and assorted brights.