It’s not hard to use bright colours in a traditional space. Use a pillow or piece of furniture for inspiration. The contrast of the green/blue against the heat of the coral under-toned orange; really create a fresh summer look. You can then leave the walls a nice calming neutral, especially in the cream family.
For this look try:
1. HC-138 “Covington Blue” by Benjamin Moore.
2. 2170-30 “Autumn Cover” by Benjamin Moore.
3. OC-10 “White Sand” by Benjamin Moore.