You will be aware that I love tulips and luckily they grow well in my very free draining soil. Tulips hate summer wet which is why in the UK it is usual to lift and store them for replanting the following autumn – that is a lot of work so when I lived in England I usually treated them as annuals and planted them in pots.
Here I am lucky that most return year on year and some even naturalize to the extent that I can see some bulbs have produced 3, 4 or even 5 flowers. Certainly these are smaller than when the bulb was new and produced only one flower but in the garden situation they look very natural.
Most of the tulips I planted last autumn were in areas where I had created new beds so they look rather nude with nothing growing with them, I will rectify this either very soon as they die back or in autumn.
There are always seedlings of Euphorbia in the gravel paths, some I pot up but others can be moved directly where I want them.
To summarise, I have had most success using Hemerocallis (short varieties), Stipa tenuissima and Euphorbia myrsinites as companion plants. If you have any other suggestions that work for you, do let me know.