Recently, I started learning about Bianchi modular forms. The definition of Bianchi modular forms can be found here. I have seen very few examples of Bianchi modular forms. So, I would like to ask the following questions:
Can one give few examples of Bianchi modular forms or give a reference where I can find a few examples?
In particular, can one construct Eisenstein series in the case of Bianchi modular forms (of arbitrary level and weight)? The following paper of Jurgen Elstrodt and Fritz Gruenwald Eisenstein series on three dimensional hyperbolic space and imaginary quadratic number fields constructs an Eisenstein series of weight $h_{K}$. ($h_{K}$ denotes the class number of $K$)
Please correct me if I'm wrong (or) imprecise.