You can use the pmpro_paypal_button_image filter. Docs here:
http://www.paidmembershipspro.com/hook/pmpro_paypal_button_image/
Example here: https://gist.github.com/strangerstudios/43cac2cbcef66e7461b8
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strangerstudios on "[Plugin: Paid Memberships Pro] Customizing PayPal Express Logo"
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