The ornamental design for an accessory for portableelectronicdevices, as shown and described.
FIG. 1 is front perspective view of a accessory for portable electronic devices;
FIG. 2 is front elevational view thereof, the rear being a mirror image;
FIG. 3 is a left side elevational view thereof, the right side being a mirror image;
FIG. 4 is a top plan view thereof;
FIG. 5 is bottom plan view thereof;
FIG. 6 is a side perspective view thereof as applied to a portable electronic device; and,
FIG. 7 is second side perspective view thereof as applied to a portable electronic device.
The broken line showing of a portable electronic device is for the purpose of illustrating the application of an accessory for portable electronic devices and forms no part of the claimed design.