The ornamental design for a flotationdevice with surfaceornamentation, as shown and described.
FIG. 1 is a top perspective view of a flotation device with surface ornamentation, showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right elevation view thereof; and,
FIG. 7 is a left elevation view thereof.
The broken lines in the drawing depicting portions of the floatation device with surface ornamentation are for illustrative purposes only and form no part of the claimed design.