Would a weather-resistant wall sculpture be the right touch for a lanai, an outdoor pool area, or a courtyard?  A ceramic sun, moon, or fantasy creature can be mounted like a picture, or permanently, and embellished with 3-D colored glass or ceramic rays and other trim. Free-standing sculpture from ceramic and glass are also possibilities:  see my sculpture website www.RareCreatures.com for more ideas, and Contact Me!
Rather than a blank wall, or a blank quattrefoil, how about a creature, or a sun, or a classical face, creating a spot of interest and surprise? This example glazed ceramic,9"h x 12 " l x 8" w, mountable inside or out.  Creatures can also be made as fountain heads. Wired to hang on interior or exterior walls from hook, bolt, or screw.  Shown here on outdoor wall.  Can be made more secure and permanent using clear silicone window/door sealer.  Commissions welcome.  This size $195.  Installation advice is free; assistance is additional charge.
Outdoor ceramic mosaics can be custom designed and mounted permanently (or like a picture) to garden walls, outdoor kitchen walls, or any interior space.
Mosaic:  available for installation, inside or out.  36" x 36".  Sky pieces are more blue than they appear due to limitations of screen colors.  Recommend black grout.  Installation can be arranged for extra charge.  $600.
I enjoy creating landscapes and will sketch a design for you before executing a mosaic.  Or, suggest a topic, color scheme, or other "hint" and I will create options for your wall space - inside or out. (Sketch for commission shown here.)