|velcro and ribbon... so easy!|
I'm going to let you in on a little secret though and this is the best part for me... I use the clip art and font colors to "code" my students so I can quickly group them for different mixed-ability purposes. I know to mix up the clip art and font colors for mixed-ability, mixed-temperment groups. I literally shuffle the stack and randomly assign students to create balanced groups. I can also allow for student choice by telling students they need partner up a dragon with a knight, etc.
To attach them to the wall, I stapled strips of wide ribbon straight down the wall. Then I attached Velcro to the ribbon and the tags so I can easily rearrange them as needed.