Depends on what you are trying to achieve. If you're just looking for any recipe that uses this combo I know Tripel Karmeliet is made with malted oats, wheat and barley as well as unmalted oats, wheat and barley. Northernbrewer has a clone partial mash kit under the name Carmelite.
Otherwise oats and wheat would usually be chosen for some particular contribution they make. For example flaked oats are commonly used in 0.5-1lb per 5 gallon to give a slick or creamy mouthfeel as in a stout. Golden naked oats apparently give a nutty sweetness (never used them). Lots of recipes use a little wheat for head retention, or it might be used in a lot larger proportion as the primary base depending on style.
Do you have a particular style in mind?