I used a white card base and several layers of matting. I've used this background stamp from GinaK Designs (Inspiration Mosaic) so many times. It's one of my all-time favorites. The sentiment is part of the Inspiration Mosaic collection. The flourish stamp is from Inkadinkado.
I love matching envelopes, so I always fancy them up if I have time.
Enjoy your day and stay safe out there. May the Lord be glorified by the work of my hands.