It may be overkill, but a fresh tomato from the garden is worth it.
I'm starting a lot of my tomato seeds in a Sterilite container fitted with a rope light across the bottom (much cheaper than heat mats, and not hard to build). I first read about this cool use of rope lights here. I also have been following Our Engineered Garden, where EG has made and posted about all sorts of wonderful home-made devices for seed starting. He also makes his own self-watering containers. I decided to add a grow light over the top of mine this year, because putting the starts in a South-facing window really isn't enough.
The tomato seeds have only been in there for three days, and they are already sprouting!
I've also direct-sowed more flower seeds out in the beds under cloches made from plastic milk jugs. It looks ugly (and hopefully my neighbors won't complain). I've sown Liatris, Echinacea 'Bravado', Geum trifolum (Prairie Smoke) and Erigeron speciosus (Fleabane).
Boring list of tomato seeds that I've sown so far:
Nicholayev Yellow Cherry
Sub Arctic Plenty
We have another sunny day here today, but cold. It's 36 degrees right now. I'm hoping it hits the upper 40s, or maybe even 50. If it does, I'll probably go out and sow some more flower seeds under makeshift cloches.
Or I could just hang out in the South-facing window, with my house-bound kitties.
"Mo-om, I'm trying to sleep here!"
"Who made the kissy noise? Is it time to eat?"