This is my first post to this site, but I have been reading and enjoying for awhile now. I am a beginner gardener and becoming more and more obsessed :-) My question is about what suggestions people have for plants that can be planted over or among my spring bulbs to dress up the appearance of the dying foliage. The bed is full sun, well draining. It has bulbs of pink tulips and purple irises which are beautiful but look too spaced out and now have no flowers. I also don't have a lot of money to spend. Ideally, I was looking for a plant blooming around this time of year with yellow flowers, nicely spreading, maybe 8-16" tall. I am looking forward to hearing your suggestions and thanks for reading this.

I have yellow bearded iris which is budding right now planted among some tulips. The only problem is iris clumps get really big so you have to divide them every 3-4 years. But they bloom right about the time tulips fade.
If you don't mind using pansies they come in all colours, so you shouldn't have a problem finding yellow ones. And they self-seed so you'll get volunteers.

Annuals in front of, or in among your spring bulbs can also hide their dying foliage. I plant nasturtiums every year in the front of one of my bulb beds. They bloom so profusely by the end of summer, they're quite spectacular.

(Sorry in my earlier reply I suggested irisis but hadn't noticed you've already got them and they were already fading - I'm in a colder zone so things bloom later here)