This PDF includes 12 colorful Spanish interjections. These 8.5x11" pages can be printed on cardstock and posted around the classroom. I recommend laminating if possible.
The included interjections posters are:
Órale, No me digas, Ojalá, Gracias a Dios, Qué lástima, No manches, Rayos, Ay caramba, Ay Dios Mío, Qué padre, Qué chévere, Qué guay
Be sure to submit any special requests in the comments and I can add more to the list.