The Members feature in Ghost launched with support for USD. We've now added support for four additional currencies: CAD, AUD, GBP, EUR.
Select your chosen currency for your subscriptions from the Members Settings, and set your pricing tiers:
Then you're all set. When you enter your currency and pricing in Ghost, it automatically creates those plans in Stripe in the correct currency. Now your readers can support your work with monthly or annual subscriptions in your chosen currency.
For more information about outputting currencies and price in your theme, check out our documentation.