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Whaaat? Omg come to Sweden girl and I will show you blue berry heaven :).
Yeah you can use strawberries, raspberries or blackberries if you have them. Frozen berries works just as good as fresh ones :). If not even better to make it a little colder and fresher =)

hehehehe I take your invitation!!!!, I'll look for strawberries at the local market

You are welcome any time :) But the summer in july/august is better to visit since it's really cold otherwise ;)