This activity can be a lot of fun and requires some prep.
I ask my colleagues to share their license plate numbers with me. Once I have 7-10 I will write them down with the color of the vehicle.
I will take the students out to the parking lot, put them in groups of four or five, and give them a small white board and marker. It helps if they have a camera (phone or ipad or similar)
I will read a sequence to each group (3-4 groups max for sanity) and let a student in each group write what they think I said on the board. On my mark, they go looking for the license plate in the lot. When they find it, they must stand with their entire group and take a self with the entire license plate visible. Then they have to identify the color in Spanish.
The students report back to me, show me the picture and I choose one student to tell me the color. If correct, I read them another license plate.
Try mixing it up by giving them bumper sticker letters and other decor found on vehicles.
Wild fun- kids get exercise. I always make them delete the picture in front of me and tell them that if they set off car alarms that their group gets a zero for the activity.
A variation is to record yourself saying each license plate sequence onto an individual Mp3 device and then giving a device to the group so they can listen to it again and again until they figure it out. When they figure one out, they return the device to you and take a different device. If I do this style, I don't let them write the sequence down.