Bobbin covers and accessories are very easy to replace, reasonably priced. Let me know because I have some that may be just what you are looking for...
Sewing Machines:
---Pfaff Creative 3.0 - sewing and embroidery
---Pfaff Tiptronic 6270 (Antonio) - my workhorse, use it 90% of the time
---Singer 221 Featherweight (Samson) - made in 1946
---Singer 99-13 - made in 1946, cast iron!
---New Royal treadle - my great grandmother's, still works but I never use it