If you don't have your frame to look so messy, you can just make a design without the grout. Just stick all the mosaic side by side to each other without leaving empty spaces. Simple as that.
Sample of mosaicDIY photo frame WITHOUT grout.
A perfect gift for Valentines or anniversaries. =]
P/S : Grout is the WHITE CLAY thing that you stuff between the mosaics, which is not available in this photo frame.
P/P/S : The quantity of the mosaics sold is more than enough for designs with or without grout.