i do a panty-dropper blackberry wheat all the time. It's so easy.
5 gallons all grain
5.5 lbs 2 row
5.5 lbs wheat malt
1/2 oz mild bittering hop like magnum or 1 oz something low alpha like willamette
for the 60 min boil
either american wheat yeast or wlp001 - really doesn't make much difference in a side-by-side
3 lbs canned fruit slurry in secondary fermenter as fermentation slows, say after 5-6 days at about 68. Leave on fruit for a week or so.
With strawberries, I'd use maybe twice as much fruit. It also helps to mash it up a bit.
I use generic oregon fruit purees I can get in cans at my local grocery store. THey are generic versions of the oregon fruit purees you can get from northern brewer or similar.
FOr extract I'd sub maybe 1 can pale extract and 1 can wheat? Not real sure about converting grain to extract.
This makes an incredibly drinkable, tasty, simple beer that my wife loves.