Answer: I think you mean Euonymus fortunei, which comes in many low-growing forms in various shades of green and yellow. Though the species E. fortunei is hardy to zone 4b, not all the cultivated varieties are. Some are groundcovers ('Colorata'), others are compact shrubs ('Emerald 'n Gold'), so spacing of plants varies.
There are short, spreading evergreens in shades of yellow and green that will stand your winters -- look for Juniperus communis var. saxatilis, or 'Depressa Aurea', among others. Best of luck!
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